The following are some terms and phrases and corresponding context when used in relation to DPN.
This document has been superseded and is available here for reference only. - Pcolar 20150509
Common Terms
AMQP (Advanced Message Queuing Protocol): An open standard for passing business messages between applications or organizations. Implemented in DPN to communicate and coordinate activities between nodes in the DPN network. more info...
Auditing: Demonstrating that DPN is providing the preservation services it has contracted to provide for DPN Members. Auditing will be done at several different levels, including object management, preservation actions and infrastructure.
Bag: An individual preservation item stored in BagIt format (see below).
BagIt: A "hierarchical file packaging format designed to support disk-based storage and network transfer of arbitrary digital content." DPN uses this format for the storage of digital objects, ensuring the integrity of each preserved object for durability. more info...
Brightening: In the advent of a failure of a First Node, another DPN node will work with the owners of particular DPN content to ensure they can gain access again to the preservation package created by the original First Node.
Checksum: Also called a hash, a checksum is a randomly generated piece of data that is used to verify the fixity of a digital object (see below). It is most commonly used to detect whether a digital object has changed over time.
DPN Charter Member: An institution or organization contributing financially to establish and support DPN prior to June 30, 2013 (current members). Initial DPN Depositors must all be Charter Members.
DPN Depositor: An institution or organization working directly with an individual DPN Node to negotiate contracts, determine service levels, and deposit materials into DPN via the First Node (see below).
DPN Digital Object: An individual preservation item of preserved digital content. See also Bag.
DPN Node: Content is held in DPN at nodes. These are individual organizations and institutions that provide storage and preservation actions for DPN Depositors.DPN will replicate the content from the First Node (see below) to other DPN Nodes, also known as Replicating Nodes.
First Class Digital Object: A DPN Digital Object that is audited and its integrity is maintained. A First Class Object may contain Second Class object(s). Second Class objects are not individually audited.
First Node: DPN Depositors will work directly with an individual DPN Node to negotiate contracts, determine service levels, and deposit materials. This node is known as the "First Node."
Fixity: Checking the fixity of a digital object is the process of verifying that it has not been changed or corrupted.
Ingestion: The process of bringing DPN Depositor content into the network. Ingestion happens via a DPN First Node.
Package: Organizing and grouping content into discrete units, particularly for storage and data transfer. DPN will be using Bags as an organizational unit. (See "Bag" above.)
Registry: DPN will maintain a registry of replicated content to allow management of Digital Objects in the DPN network. It will track the identity, source, location of copies, previous version, legal agreements, and fixity of content in DPN.
Replicating Node: DPN will replicate the content from the First Node (see above) to other DPN Nodes, known as Replicating Nodes. Content in Replicating Nodes will be held “dark”, and inaccessible except for preservation actions.
Succession: As a preservation network for the academy and by the academy, content preserved in DPN will be covered by succession rights that will allow the content to be used in the future by the academy after the dissolution of the source of the content.
TDR (Trustworthy Digital Repository): A repository certified as meeting TRAC requirements.
TRAC (Trusted Digital Repositories and Audit Checklist): A checklist of best practices for Trust Digitial Repositories built on the recommendations for TDR. more info...
